Oh aren't we bad we Westeners? All this talk about that common sense thing and this rationality!
No, seriously, 'ultra rational'? I wish it were! Our society is an esoteric jungle, a mumbo-jumbo of bronze age mythology and pseudo-scientific nonsense.
There's no impasse, if it worked, it could be demonstrated scientifically in simple experiments. One just needs enough data to get statistically significant results. This has been done, and of course, it didn't produce any results in favor of astrology.
Well of course it served some purpose, that doesn't mean it can't be rubbish.
By the way, I can't believe no one has posted this yet:
http://www.youtube.com/watch?v=w59boLMnrbU
(@ soundofmusic, so much for starting a conversation with astrology :D )